Q: A $$12\,\text{V}$$ battery with an internal resistance of $$0.5\,\Omega is $$connected to a $$5.5\,\Omega$$ resistor. What is the terminal voltage of the battery when the circuit is operating?

$$V_{\text{terminal}} = 11\,\text{V}$$

Q: A patient’s blood pressure is measured as $$120/80\,\text{mmHg}. $$What is the maximum pressure in pascals? ($$1\,\text{mmHg} = 133\,\text{Pa})$$

$$1.60 \times 10^4$\,\text{Pa}$$

Question 1

A 2 kg block is pushed across a horizontal surface with a constant force of 10 N. The coefficient of kinetic friction between the block and the surface is 0.2. What is the acceleration of the block? (Assume $$g = 9.8\,	ext{m/s}^2.)$$

Accepted Answer

$$a = 3.04\,	ext{m/s}^2$$

Question 2

A patient receives an electric shock from a defibrillator that delivers a current of $$2.0\,	ext{A}$$ for $$0.01\,	ext{s}. $$What is the total charge transferred to the patient?

Accepted Answer

$$Q = 0.02\,	ext{C}$$

Question 3

A $$12\,	ext{V}$$ battery with an internal resistance of $$0.5\,\Omega is $$connected to a $$5.5\,\Omega$$ resistor. What is the terminal voltage of the battery when the circuit is operating?

Accepted Answer

$$V_{	ext{terminal}} = 11\,	ext{V}$$

Question 4

A $$5\,\mu	ext{F}$$ capacitor is charged to $$100\,	ext{V}. $$How much energy is stored in the capacitor?

Accepted Answer

$$U = 0.025\,	ext{J}$$

Question 5

A diver with a mass of $$70\,	ext{kg}$$ jumps from a platform $$10\,	ext{m}$$ above the water. Neglecting air resistance, what is the diver’s speed just before hitting the water? ($$g = 9.8\,	ext{m/s}^2)$$

Accepted Answer

$$v = 14\,	ext{m/s}$$

Question 6

A sound wave in air has an intensity of $$1.0 	imes 10$$^{-6}$$\,	ext{W/m}^2. $$What is its intensity level in decibels (dB)? ($$I_0 = 1.0$$ 	imes $$10^{-12}$$\,	ext{W/m}^2$$)

Accepted Answer

$$L = 90\,	ext{dB}$$

Question 7

A radioactive isotope has a half-life of $$8$$ hours. If you start with $$80\,	ext{mg}$$, how much remains after $$24$$ hours?

Accepted Answer

$$10\,	ext{mg}$$

Question 8

A patient’s blood pressure is measured as $$120/80\,	ext{mmHg}. $$What is the maximum pressure in pascals? ($$1\,	ext{mmHg} = 133\,	ext{Pa})$$

Accepted Answer

$$1.60 	imes 10^4$\,	ext{Pa}$$

Question 9

A ray of light passes from glass ($$n = 1.5) $$into air ($$n = 1.0). $$What is the critical angle for total internal reflection?

Accepted Answer

$$	heta_c = 41.8^\circ$$

Question 10

A $$0.5\,	ext{kg}$$ mass attached to a spring oscillates with amplitude $$0.1\,	ext{m}$$ and spring constant $$k = 200\,	ext{N/m}. $$What is the total mechanical energy of the system?

Accepted Answer

$$E = 1\,	ext{J}$$

Question 11

A $$0.2\,	ext{kg}$$ ball is thrown horizontally from a $$20\,	ext{m}$$ high cliff with a speed of $$5\,	ext{m/s}. $$How far from the base of the cliff does the ball land? ($$g = 9.8\,	ext{m/s}^2)$$

Accepted Answer

$$14.3\,	ext{m}$$

Question 12

A transformer has $$100$$ turns on the primary coil and $$500$$ turns on the secondary coil. If the input voltage is $$120\,	ext{V}$$, what is the output voltage?

Accepted Answer

$$600\,	ext{V}$$

Question 13

A $$0.1\,	ext{mol}$$ sample of an ideal gas is at $$300\,	ext{K}$$ and occupies $$2.5\,	ext{L}. $$What is the pressure of the gas? ($$R = 8.31\,	ext{J/mol·K}$$, $$1\,	ext{L} = 0.001\,	ext{m}^3)$$

Accepted Answer

$$P = 99.7\,	ext{kPa}$$

Question 14

A nurse uses a hydraulic lift to raise a patient. If the input piston has an area of $$0.01\,	ext{m}^2$$ and the output piston has an area of $$0.5\,	ext{m}^2$$, what input force is needed to lift a $$500\,	ext{N}$$ patient?

Accepted Answer

$$10\,	ext{N}$$

Question 15

A $$2.0\,	ext{m}$$ long string with a mass per unit length $$\mu = 0.01\,	ext{kg/m} is $$under a tension of $$80\,	ext{N}. $$What is the fundamental frequency of vibration?

Accepted Answer

$$f = 22.4\,	ext{Hz}$$

Question 16

A $$0.5\,	ext{kg}$$ object moves at $$4\,	ext{m/s}$$ and collides elastically with a stationary $$0.5\,	ext{kg}$$ object. What is the velocity of the first object after the collision?

Accepted Answer

$$0\,	ext{m/s}$$

Question 17

A $$1.0\,	ext{kg}$$ block is attached to a horizontal spring ($$k = 100\,	ext{N/m}) $$and pulled $$0.2\,	ext{m}$$ from equilibrium, then released. What is the maximum speed of the block?

Accepted Answer

$$2.0\,	ext{m/s}$$

Question 18

A $$3.0\,	ext{kg}$$ object is moving at $$6.0\,	ext{m/s}. $$What is its kinetic energy?

Accepted Answer

$$KE = 54\,	ext{J}$$

Question 19

A $$0.5\,	ext{kg}$$ sample of water at $$20^\circ	ext{C}$$ absorbs $$42,000\,	ext{J} of $$heat. What is the final temperature? (Specific heat of water $$c = 4,200\,	ext{J/kg·K})$$

Accepted Answer

$$T = 40^\circ	ext{C}$$

Question 20

A car horn emits a sound at $$500\,	ext{Hz}. If $$the car approaches a stationary observer at $$30\,	ext{m/s} ($$speed of sound $$v = 343\,	ext{m/s}$$), what frequency does the observer hear?

Accepted Answer

$$f' = 545\,	ext{Hz}$$

Comprehensive Physics Study Notes for Medical Entrance Exam (PUMS 2025)

Guida di studio - Domande di pratica

Study guide - Flashcard